This slide shows the front panel of the DRF. Output terminals are located at the top, input terminals at the bottom. The output voltage can be adjusted using the potentiometer or trimmer. A green LED indicates that the output voltage is >80% of the rated output voltage. A red LED indicates that the unit is in the peak power mode. In normal operation the DC OK relay contacts are closed when the output voltage is greater than 80% of the nominal output voltage. When the output is less than 80%, the relay contacts are open.